/*
 * Copyright 2000-2017 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.intellij.openapi.progress;

import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

public class EmptyProgressIndicator implements StandardProgressIndicator {

    private volatile boolean myIsRunning;
    private volatile boolean myIsCanceled;

    public EmptyProgressIndicator() {
    }

    @Override
    public void start() {
        myIsRunning = true;
        myIsCanceled = false;
    }

    @Override
    public void stop() {
        myIsRunning = false;
    }

    @Override
    public boolean isRunning() {
        return myIsRunning;
    }

    @Override
    public final void cancel() {
        myIsCanceled = true;
    }

    @Override
    public final boolean isCanceled() {
        return myIsCanceled;
    }

    @Override
    public final void checkCanceled() {
        if (myIsCanceled) {
            throw new ProcessCanceledException();
        }
    }

    @Override
    public void setText(String text) {
    }

    @Override
    public String getText() {
        return "";
    }

    @Override
    public void setText2(String text) {
    }

    @Override
    public String getText2() {
        return "";
    }

    @Override
    public double getFraction() {
        return 1;
    }

    @Override
    public void setFraction(double fraction) {
    }

    @Override
    public void pushState() {
    }

    @Override
    public void popState() {
    }

    @Override
    public void startNonCancelableSection() {
    }

    @Override
    public void finishNonCancelableSection() {
    }

    @Override
    public boolean isModal() {
        return false;
    }

    @Override
    public void setModalityProgress(ProgressIndicator modalityProgress) {
    }

    @Override
    public boolean isIndeterminate() {
        return false;
    }

    @Override
    public void setIndeterminate(boolean indeterminate) {
    }

    @Override
    public boolean isPopupWasShown() {
        return false;
    }

    @Override
    public boolean isShowing() {
        return false;
    }

    @NotNull
    public static ProgressIndicator notNullize(@Nullable ProgressIndicator indicator) {
        if (indicator != null) {
            return indicator;
        }
        return new EmptyProgressIndicator();
    }
}
